Abstract

In the integrated optics electromagnetic field problems have to be solved with numerical methods, where the structure has to be surrounded by a box of metallic or magnetic walls, whereby box modes can occur and complicate the numerical evaluation. Because these boundaries must not have any influence on the field distribution, the distance between the walls must be chosen very large, especially in case of a structure with a weak confinement. For such a structure the numerical effort is high. In [1] we could demonstrate that these disadvantages can be vanquished by introduction of special absorbing boundary conditions (SABC) in the method of lines (MoL) for the analysis of slab waveguides. Now we will present improved SABC for the analysis of single or coupled channel waveguides and we will elucidate the advantages in relation to the hitherto used Dirichlet and Neumann boundary conditions.

© 1993 Optical Society of America